Fix verbosity bug in --collect-only (pytest-dev#5391)

Fix verbosity bug in --collect-only

Author: nicoddemus

changelog/5383.bugfix.rst

@@ -0,0 +1,2 @@
+``-q`` has again an impact on the style of the collected items
+(``--collect-only``) when ``--log-cli-level`` is used.

src/_pytest/logging.py

@@ -424,10 +424,6 @@ def __init__(self, config):
         """
         self._config = config
 
-        # enable verbose output automatically if live logging is enabled
-        if self._log_cli_enabled() and config.getoption("verbose") < 1:
-            config.option.verbose = 1
-
         self.print_logs = get_option_ini(config, "log_print")
         self.formatter = self._create_formatter(
             get_option_ini(config, "log_format"),
@@ -644,6 +640,15 @@ def pytest_sessionstart(self):
     @pytest.hookimpl(hookwrapper=True)
     def pytest_runtestloop(self, session):
         """Runs all collected test items."""
+
+        if session.config.option.collectonly:
+            yield
+            return
+
+        if self._log_cli_enabled() and self._config.getoption("verbose") < 1:
+            # setting verbose flag is needed to avoid messy test progress output
+            self._config.option.verbose = 1
+
         with self.live_logs_context():
             if self.log_file_handler is not None:
                 with catching_logs(self.log_file_handler, level=self.log_file_level):

testing/logging/test_reporting.py

@@ -921,14 +921,45 @@ def test_collection_live_logging(testdir):
 
     result = testdir.runpytest("--log-cli-level=INFO")
     result.stdout.fnmatch_lines(
-        [
-            "collecting*",
-            "*--- live log collection ---*",
-            "*Normal message*",
-            "collected 0 items",
-        ]
+        ["*--- live log collection ---*", "*Normal message*", "collected 0 items"]
+    )
+
+
+@pytest.mark.parametrize("verbose", ["", "-q", "-qq"])
+def test_collection_collect_only_live_logging(testdir, verbose):
+    testdir.makepyfile(
+        """
+        def test_simple():
+            pass
+    """
     )
 
+    result = testdir.runpytest("--collect-only", "--log-cli-level=INFO", verbose)
+
+    expected_lines = []
+
+    if not verbose:
+        expected_lines.extend(
+            [
+                "*collected 1 item*",
+                "*<Module test_collection_collect_only_live_logging.py>*",
+                "*no tests ran*",
+            ]
+        )
+    elif verbose == "-q":
+        assert "collected 1 item*" not in result.stdout.str()
+        expected_lines.extend(
+            [
+                "*test_collection_collect_only_live_logging.py::test_simple*",
+                "no tests ran in * seconds",
+            ]
+        )
+    elif verbose == "-qq":
+        assert "collected 1 item*" not in result.stdout.str()
+        expected_lines.extend(["*test_collection_collect_only_live_logging.py: 1*"])
+
+    result.stdout.fnmatch_lines(expected_lines)
+
 
 def test_collection_logging_to_file(testdir):
     log_file = testdir.tmpdir.join("pytest.log").strpath